head: fix subtraction underflow with --bytes=-N #7036
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Fix a subtraction underflow that occurred on `head --bytes=-N` when the
input had fewer than `N` bytes. Before this commit,
printf "a" | head -c -2
would panic. After this commit, it terminates successfully with no
output as expected.
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GNU testsuite comparison: |
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Fix a subtraction underflow that occurred on
head --bytes=-Nwhen the input had fewer thanNbytes. Before this commit,would panic. After this commit, it terminates successfully with no output as expected.